1 // -*- C++ -*- 2 //===-------------------------- utility -----------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #ifndef _LIBCPP_UTILITY 12 #define _LIBCPP_UTILITY 13 14 /* 15 utility synopsis 16 17 namespace std 18 { 19 20 template <class T> 21 void 22 swap(T& a, T& b); 23 24 namespace rel_ops 25 { 26 template<class T> bool operator!=(const T&, const T&); 27 template<class T> bool operator> (const T&, const T&); 28 template<class T> bool operator<=(const T&, const T&); 29 template<class T> bool operator>=(const T&, const T&); 30 } 31 32 template<class T> 33 void 34 swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value && 35 is_nothrow_move_assignable<T>::value); 36 37 template <class T, size_t N> 38 void 39 swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b))); 40 41 template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14 42 template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14 43 44 template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14 45 46 template <class T> 47 typename conditional 48 < 49 !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value, 50 const T&, 51 T&& 52 >::type 53 move_if_noexcept(T& x) noexcept; // constexpr in C++14 54 55 template <class T> typename add_rvalue_reference<T>::type declval() noexcept; 56 57 template <class T1, class T2> 58 struct pair 59 { 60 typedef T1 first_type; 61 typedef T2 second_type; 62 63 T1 first; 64 T2 second; 65 66 pair(const pair&) = default; 67 pair(pair&&) = default; 68 constexpr pair(); 69 pair(const T1& x, const T2& y); // constexpr in C++14 70 template <class U, class V> pair(U&& x, V&& y); // constexpr in C++14 71 template <class U, class V> pair(const pair<U, V>& p); // constexpr in C++14 72 template <class U, class V> pair(pair<U, V>&& p); // constexpr in C++14 73 template <class... Args1, class... Args2> 74 pair(piecewise_construct_t, tuple<Args1...> first_args, 75 tuple<Args2...> second_args); 76 77 template <class U, class V> pair& operator=(const pair<U, V>& p); 78 pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value && 79 is_nothrow_move_assignable<T2>::value); 80 template <class U, class V> pair& operator=(pair<U, V>&& p); 81 82 void swap(pair& p) noexcept(noexcept(swap(first, p.first)) && 83 noexcept(swap(second, p.second))); 84 }; 85 86 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 87 template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 88 template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 89 template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 90 template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 91 template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14 92 93 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14 94 template <class T1, class T2> 95 void 96 swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y))); 97 98 struct piecewise_construct_t { }; 99 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 100 101 template <class T> class tuple_size; 102 template <size_t I, class T> class tuple_element; 103 104 template <class T1, class T2> struct tuple_size<pair<T1, T2> >; 105 template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >; 106 template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >; 107 108 template<size_t I, class T1, class T2> 109 typename tuple_element<I, pair<T1, T2> >::type& 110 get(pair<T1, T2>&) noexcept; // constexpr in C++14 111 112 template<size_t I, class T1, class T2> 113 const typename const tuple_element<I, pair<T1, T2> >::type& 114 get(const pair<T1, T2>&) noexcept; // constexpr in C++14 115 116 template<size_t I, class T1, class T2> 117 typename tuple_element<I, pair<T1, T2> >::type&& 118 get(pair<T1, T2>&&) noexcept; // constexpr in C++14 119 120 template<class T1, class T2> 121 constexpr T1& get(pair<T1, T2>&) noexcept; // C++14 122 123 template<size_t I, class T1, class T2> 124 constexpr T1 const& get(pair<T1, T2> const &) noexcept; // C++14 125 126 template<size_t I, class T1, class T2> 127 constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14 128 129 // C++14 130 131 template<class T, T... I> 132 struct integer_sequence 133 { 134 typedef T value_type; 135 136 static constexpr size_t size() noexcept; 137 }; 138 139 template<size_t... I> 140 using index_sequence = integer_sequence<size_t, I...>; 141 142 template<class T, T N> 143 using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>; 144 template<size_t N> 145 using make_index_sequence = make_integer_sequence<size_t, N>; 146 147 template<class... T> 148 using index_sequence_for = make_index_sequence<sizeof...(T)>; 149 150 template<class T, class U=T> 151 T exchange(T& obj, U&& new_value); 152 } // std 153 154 */ 155 156 #include <__config> 157 #include <__tuple> 158 #include <type_traits> 159 160 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 161 #pragma GCC system_header 162 #endif 163 164 _LIBCPP_BEGIN_NAMESPACE_STD 165 166 namespace rel_ops 167 { 168 169 template<class _Tp> 170 inline _LIBCPP_INLINE_VISIBILITY 171 bool 172 operator!=(const _Tp& __x, const _Tp& __y) 173 { 174 return !(__x == __y); 175 } 176 177 template<class _Tp> 178 inline _LIBCPP_INLINE_VISIBILITY 179 bool 180 operator> (const _Tp& __x, const _Tp& __y) 181 { 182 return __y < __x; 183 } 184 185 template<class _Tp> 186 inline _LIBCPP_INLINE_VISIBILITY 187 bool 188 operator<=(const _Tp& __x, const _Tp& __y) 189 { 190 return !(__y < __x); 191 } 192 193 template<class _Tp> 194 inline _LIBCPP_INLINE_VISIBILITY 195 bool 196 operator>=(const _Tp& __x, const _Tp& __y) 197 { 198 return !(__x < __y); 199 } 200 201 } // rel_ops 202 203 // swap_ranges 204 205 template <class _ForwardIterator1, class _ForwardIterator2> 206 inline _LIBCPP_INLINE_VISIBILITY 207 _ForwardIterator2 208 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 209 { 210 for(; __first1 != __last1; ++__first1, ++__first2) 211 swap(*__first1, *__first2); 212 return __first2; 213 } 214 215 template<class _Tp, size_t _Np> 216 inline _LIBCPP_INLINE_VISIBILITY 217 void 218 swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 219 { 220 _VSTD::swap_ranges(__a, __a + _Np, __b); 221 } 222 223 template <class _Tp> 224 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 225 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 226 typename conditional 227 < 228 !is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value, 229 const _Tp&, 230 _Tp&& 231 >::type 232 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 233 const _Tp& 234 #endif 235 move_if_noexcept(_Tp& __x) _NOEXCEPT 236 { 237 return _VSTD::move(__x); 238 } 239 240 struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { }; 241 #if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY) 242 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t(); 243 #else 244 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t(); 245 #endif 246 247 template <class _T1, class _T2> 248 struct _LIBCPP_TYPE_VIS_ONLY pair 249 { 250 typedef _T1 first_type; 251 typedef _T2 second_type; 252 253 _T1 first; 254 _T2 second; 255 256 // pair(const pair&) = default; 257 // pair(pair&&) = default; 258 259 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {} 260 261 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 262 pair(const _T1& __x, const _T2& __y) 263 : first(__x), second(__y) {} 264 265 template<class _U1, class _U2> 266 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 267 pair(const pair<_U1, _U2>& __p 268 #ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE 269 ,typename enable_if<is_convertible<const _U1&, _T1>::value && 270 is_convertible<const _U2&, _T2>::value>::type* = 0 271 #endif 272 ) 273 : first(__p.first), second(__p.second) {} 274 275 #if !defined(_LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS) && _LIBCPP_TRIVIAL_PAIR_COPY_CTOR 276 _LIBCPP_INLINE_VISIBILITY 277 pair(const pair& __p) = default; 278 #elif !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) || !_LIBCPP_TRIVIAL_PAIR_COPY_CTOR 279 _LIBCPP_INLINE_VISIBILITY 280 pair(const pair& __p) 281 _NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value && 282 is_nothrow_copy_constructible<second_type>::value) 283 : first(__p.first), 284 second(__p.second) 285 { 286 } 287 #endif 288 289 _LIBCPP_INLINE_VISIBILITY 290 pair& operator=(const pair& __p) 291 _NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value && 292 is_nothrow_copy_assignable<second_type>::value) 293 { 294 first = __p.first; 295 second = __p.second; 296 return *this; 297 } 298 299 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 300 301 template <class _U1, class _U2, 302 class = typename enable_if<is_convertible<_U1, first_type>::value && 303 is_convertible<_U2, second_type>::value>::type> 304 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 305 pair(_U1&& __u1, _U2&& __u2) 306 : first(_VSTD::forward<_U1>(__u1)), 307 second(_VSTD::forward<_U2>(__u2)) 308 {} 309 310 template<class _U1, class _U2> 311 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 312 pair(pair<_U1, _U2>&& __p, 313 typename enable_if<is_convertible<_U1, _T1>::value && 314 is_convertible<_U2, _T2>::value>::type* = 0) 315 : first(_VSTD::forward<_U1>(__p.first)), 316 second(_VSTD::forward<_U2>(__p.second)) {} 317 318 #ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS 319 _LIBCPP_INLINE_VISIBILITY 320 pair(pair&& __p) = default; 321 #else 322 _LIBCPP_INLINE_VISIBILITY 323 pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value && 324 is_nothrow_move_constructible<second_type>::value) 325 : first(_VSTD::forward<first_type>(__p.first)), 326 second(_VSTD::forward<second_type>(__p.second)) 327 { 328 } 329 #endif 330 331 _LIBCPP_INLINE_VISIBILITY 332 pair& 333 operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value && 334 is_nothrow_move_assignable<second_type>::value) 335 { 336 first = _VSTD::forward<first_type>(__p.first); 337 second = _VSTD::forward<second_type>(__p.second); 338 return *this; 339 } 340 341 #ifndef _LIBCPP_HAS_NO_VARIADICS 342 343 template<class _Tuple, 344 class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type> 345 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 346 pair(_Tuple&& __p) 347 : first(_VSTD::forward<typename tuple_element<0, 348 typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))), 349 second(_VSTD::forward<typename tuple_element<1, 350 typename __make_tuple_types<_Tuple>::type>::type>(get<1>(__p))) 351 {} 352 353 354 355 template <class... _Args1, class... _Args2> 356 _LIBCPP_INLINE_VISIBILITY 357 pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args, 358 tuple<_Args2...> __second_args) 359 : pair(__pc, __first_args, __second_args, 360 typename __make_tuple_indices<sizeof...(_Args1)>::type(), 361 typename __make_tuple_indices<sizeof...(_Args2) >::type()) 362 {} 363 364 template <class _Tuple, 365 class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type> 366 _LIBCPP_INLINE_VISIBILITY 367 pair& 368 operator=(_Tuple&& __p) 369 { 370 typedef typename __make_tuple_types<_Tuple>::type _TupleRef; 371 typedef typename tuple_element<0, _TupleRef>::type _U0; 372 typedef typename tuple_element<1, _TupleRef>::type _U1; 373 first = _VSTD::forward<_U0>(_VSTD::get<0>(__p)); 374 second = _VSTD::forward<_U1>(_VSTD::get<1>(__p)); 375 return *this; 376 } 377 378 #endif // _LIBCPP_HAS_NO_VARIADICS 379 380 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 381 _LIBCPP_INLINE_VISIBILITY 382 void 383 swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value && 384 __is_nothrow_swappable<second_type>::value) 385 { 386 _VSTD::iter_swap(&first, &__p.first); 387 _VSTD::iter_swap(&second, &__p.second); 388 } 389 private: 390 391 #ifndef _LIBCPP_HAS_NO_VARIADICS 392 template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2> 393 _LIBCPP_INLINE_VISIBILITY 394 pair(piecewise_construct_t, 395 tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args, 396 __tuple_indices<_I1...>, __tuple_indices<_I2...>); 397 #endif // _LIBCPP_HAS_NO_VARIADICS 398 }; 399 400 template <class _T1, class _T2> 401 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 402 bool 403 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 404 { 405 return __x.first == __y.first && __x.second == __y.second; 406 } 407 408 template <class _T1, class _T2> 409 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 410 bool 411 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 412 { 413 return !(__x == __y); 414 } 415 416 template <class _T1, class _T2> 417 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 418 bool 419 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 420 { 421 return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second); 422 } 423 424 template <class _T1, class _T2> 425 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 426 bool 427 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 428 { 429 return __y < __x; 430 } 431 432 template <class _T1, class _T2> 433 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 434 bool 435 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 436 { 437 return !(__x < __y); 438 } 439 440 template <class _T1, class _T2> 441 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 442 bool 443 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y) 444 { 445 return !(__y < __x); 446 } 447 448 template <class _T1, class _T2> 449 inline _LIBCPP_INLINE_VISIBILITY 450 typename enable_if 451 < 452 __is_swappable<_T1>::value && 453 __is_swappable<_T2>::value, 454 void 455 >::type 456 swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y) 457 _NOEXCEPT_((__is_nothrow_swappable<_T1>::value && 458 __is_nothrow_swappable<_T2>::value)) 459 { 460 __x.swap(__y); 461 } 462 463 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 464 465 template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY reference_wrapper; 466 467 template <class _Tp> 468 struct __make_pair_return_impl 469 { 470 typedef _Tp type; 471 }; 472 473 template <class _Tp> 474 struct __make_pair_return_impl<reference_wrapper<_Tp>> 475 { 476 typedef _Tp& type; 477 }; 478 479 template <class _Tp> 480 struct __make_pair_return 481 { 482 typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type; 483 }; 484 485 template <class _T1, class _T2> 486 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 487 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 488 make_pair(_T1&& __t1, _T2&& __t2) 489 { 490 return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type> 491 (_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2)); 492 } 493 494 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 495 496 template <class _T1, class _T2> 497 inline _LIBCPP_INLINE_VISIBILITY 498 pair<_T1,_T2> 499 make_pair(_T1 __x, _T2 __y) 500 { 501 return pair<_T1, _T2>(__x, __y); 502 } 503 504 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 505 506 template <class _T1, class _T2> 507 class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> > 508 : public integral_constant<size_t, 2> {}; 509 510 template <class _T1, class _T2> 511 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const pair<_T1, _T2> > 512 : public integral_constant<size_t, 2> {}; 513 514 template <class _T1, class _T2> 515 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> > 516 { 517 public: 518 typedef _T1 type; 519 }; 520 521 template <class _T1, class _T2> 522 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> > 523 { 524 public: 525 typedef _T2 type; 526 }; 527 528 template <class _T1, class _T2> 529 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, const pair<_T1, _T2> > 530 { 531 public: 532 typedef const _T1 type; 533 }; 534 535 template <class _T1, class _T2> 536 class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, const pair<_T1, _T2> > 537 { 538 public: 539 typedef const _T2 type; 540 }; 541 542 template <size_t _Ip> struct __get_pair; 543 544 template <> 545 struct __get_pair<0> 546 { 547 template <class _T1, class _T2> 548 static 549 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 550 _T1& 551 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 552 553 template <class _T1, class _T2> 554 static 555 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 556 const _T1& 557 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;} 558 559 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 560 561 template <class _T1, class _T2> 562 static 563 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 564 _T1&& 565 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);} 566 567 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 568 }; 569 570 template <> 571 struct __get_pair<1> 572 { 573 template <class _T1, class _T2> 574 static 575 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 576 _T2& 577 get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 578 579 template <class _T1, class _T2> 580 static 581 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 582 const _T2& 583 get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;} 584 585 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 586 587 template <class _T1, class _T2> 588 static 589 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 590 _T2&& 591 get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);} 592 593 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 594 }; 595 596 template <size_t _Ip, class _T1, class _T2> 597 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 598 typename tuple_element<_Ip, pair<_T1, _T2> >::type& 599 get(pair<_T1, _T2>& __p) _NOEXCEPT 600 { 601 return __get_pair<_Ip>::get(__p); 602 } 603 604 template <size_t _Ip, class _T1, class _T2> 605 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 606 const typename tuple_element<_Ip, pair<_T1, _T2> >::type& 607 get(const pair<_T1, _T2>& __p) _NOEXCEPT 608 { 609 return __get_pair<_Ip>::get(__p); 610 } 611 612 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 613 614 template <size_t _Ip, class _T1, class _T2> 615 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 616 typename tuple_element<_Ip, pair<_T1, _T2> >::type&& 617 get(pair<_T1, _T2>&& __p) _NOEXCEPT 618 { 619 return __get_pair<_Ip>::get(_VSTD::move(__p)); 620 } 621 622 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 623 624 #if _LIBCPP_STD_VER > 11 625 template <class _T1, class _T2> 626 inline _LIBCPP_INLINE_VISIBILITY 627 constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT 628 { 629 return __get_pair<0>::get(__p); 630 } 631 632 template <class _T1, class _T2> 633 inline _LIBCPP_INLINE_VISIBILITY 634 constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT 635 { 636 return __get_pair<0>::get(__p); 637 } 638 639 template <class _T1, class _T2> 640 inline _LIBCPP_INLINE_VISIBILITY 641 constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT 642 { 643 return __get_pair<0>::get(_VSTD::move(__p)); 644 } 645 646 template <class _T1, class _T2> 647 inline _LIBCPP_INLINE_VISIBILITY 648 constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT 649 { 650 return __get_pair<1>::get(__p); 651 } 652 653 template <class _T1, class _T2> 654 inline _LIBCPP_INLINE_VISIBILITY 655 constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT 656 { 657 return __get_pair<1>::get(__p); 658 } 659 660 template <class _T1, class _T2> 661 inline _LIBCPP_INLINE_VISIBILITY 662 constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT 663 { 664 return __get_pair<1>::get(_VSTD::move(__p)); 665 } 666 667 #endif 668 669 #if _LIBCPP_STD_VER > 11 670 671 template<class _Tp, _Tp... _Ip> 672 struct _LIBCPP_TYPE_VIS_ONLY integer_sequence 673 { 674 typedef _Tp value_type; 675 static_assert( is_integral<_Tp>::value, 676 "std::integer_sequence can only be instantiated with an integral type" ); 677 static 678 _LIBCPP_INLINE_VISIBILITY 679 constexpr 680 size_t 681 size() noexcept { return sizeof...(_Ip); } 682 }; 683 684 template<size_t... _Ip> 685 using index_sequence = integer_sequence<size_t, _Ip...>; 686 687 namespace __detail { 688 689 template<typename _Tp, size_t ..._Extra> struct __repeat; 690 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<integer_sequence<_Tp, _Np...>, _Extra...> { 691 typedef integer_sequence<_Tp, 692 _Np..., 693 sizeof...(_Np) + _Np..., 694 2 * sizeof...(_Np) + _Np..., 695 3 * sizeof...(_Np) + _Np..., 696 4 * sizeof...(_Np) + _Np..., 697 5 * sizeof...(_Np) + _Np..., 698 6 * sizeof...(_Np) + _Np..., 699 7 * sizeof...(_Np) + _Np..., 700 _Extra...> type; 701 }; 702 703 template<size_t _Np> struct __parity; 704 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {}; 705 706 template<> struct __make<0> { typedef integer_sequence<size_t> type; }; 707 template<> struct __make<1> { typedef integer_sequence<size_t, 0> type; }; 708 template<> struct __make<2> { typedef integer_sequence<size_t, 0, 1> type; }; 709 template<> struct __make<3> { typedef integer_sequence<size_t, 0, 1, 2> type; }; 710 template<> struct __make<4> { typedef integer_sequence<size_t, 0, 1, 2, 3> type; }; 711 template<> struct __make<5> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4> type; }; 712 template<> struct __make<6> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; }; 713 template<> struct __make<7> { typedef integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; }; 714 715 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; }; 716 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; }; 717 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; }; 718 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; }; 719 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 720 template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 721 template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 722 template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; }; 723 724 template<typename _Tp, typename _Up> struct __convert { 725 template<typename> struct __result; 726 template<_Tp ..._Np> struct __result<integer_sequence<_Tp, _Np...> > { typedef integer_sequence<_Up, _Np...> type; }; 727 }; 728 template<typename _Tp> struct __convert<_Tp, _Tp> { template<typename _Up> struct __result { typedef _Up type; }; }; 729 730 } 731 732 template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked = 733 typename __detail::__convert<size_t, _Tp>::template __result<typename __detail::__make<_Np>::type>::type; 734 735 template <class _Tp, _Tp _Ep> 736 struct __make_integer_sequence 737 { 738 static_assert(is_integral<_Tp>::value, 739 "std::make_integer_sequence can only be instantiated with an integral type" ); 740 static_assert(0 <= _Ep, "std::make_integer_sequence input shall not be negative"); 741 typedef __make_integer_sequence_unchecked<_Tp, _Ep> type; 742 }; 743 744 template<class _Tp, _Tp _Np> 745 using make_integer_sequence = typename __make_integer_sequence<_Tp, _Np>::type; 746 747 template<size_t _Np> 748 using make_index_sequence = make_integer_sequence<size_t, _Np>; 749 750 template<class... _Tp> 751 using index_sequence_for = make_index_sequence<sizeof...(_Tp)>; 752 753 #endif // _LIBCPP_STD_VER > 11 754 755 #if _LIBCPP_STD_VER > 11 756 template<class _T1, class _T2 = _T1> 757 inline _LIBCPP_INLINE_VISIBILITY 758 _T1 exchange(_T1& __obj, _T2 && __new_value) 759 { 760 _T1 __old_value = _VSTD::move(__obj); 761 __obj = _VSTD::forward<_T2>(__new_value); 762 return __old_value; 763 } 764 #endif // _LIBCPP_STD_VER > 11 765 766 _LIBCPP_END_NAMESPACE_STD 767 768 #endif // _LIBCPP_UTILITY 769
